http://bugs.winehq.org/show_bug.cgi?id=6502
------- Additional Comments From ajackson@bcs.org.uk 2006-27-10 05:29 -------
From what I can tell the problem is with the call to pglDrawBuffer in
dlls/winex11.drv/opengl.c (line 1400 onwards). This is only called when the object type is OBJ_MEMDC. If you comment out this line or set the object type to 0 (as the workaround patch does) you don't get any flickering.